you must have dsp turned on for audio to be computed. but it doesn't recquire any audio in/out to be available. so using -noaudio and no sound card should not be a problem until you have dsp on.
running without interface should not be a problem as well, but i never tried outside X ...
+! aym3ric.
I have a question about the -noaudio flag. If I am running PD on a webserver without any audio card, but I am using PD to mix sounds internally and stream them to MP3, is this flag appropriate?